SP2T PIN Diode Switch

Rev. V1

MSW201x-201

3

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DS-xxxxxxx

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1. PIN diode DC reverse voltage to maintain high resistance in the OFF PIN diode is determined by RF frequency, incident power, and VSWR

as well as by the characteristics of the diode. The minimum reverse bias voltage values are provided in this datasheet. The input signal

level applied for small signal testing is approximately 0 dBm.

2. Switching time (50% TTL - 10/90% RF Voltage) is a function of the PIN diode driver performance as well as the characteristics of the

diode. An RC “current spiking network” is used on the driver output to provide a transient current to rapidly remove stored charge from the

PIN diode. Typical component values are: R = 50 to 220 Ω and C = 470 to 1,000 pF. MACOMs MPD2T28125-700 is the recommended PIN

diode driver to interface with the MSW2010-201 and MSW2011-201 SP2T switches. Its data sheet is available.

Bias State Conditions:

Transmit State

(TX - ANT in low insertion loss state):

a. B1: -100 mA

b. B2: +100 mA

c. B3: -25 mA, +28 V

d. B4: +25 mA

Small Signal Receive State

(ANT - RX in low insertion loss state):

a. B1: +28 V

b. B2: +100 mA

c. B3: -100 mA, 0 V

d. B4: +28 V

Truth Table

RF Bias Network Component Values

Part #

Frequency (MHz)

Inductors

DC Blocking Capacitors RF Bypass Capacitors

MSW2010-201

50 - 1000

4.7 µH

0.1 µF

0.1 µF

MSW2011-201

400 - 4000

43 nH

47 pF

270 pF

Evaluation Board Truth Table

Port

J0 - J1

Port

J0 - J2

Bias: B1

Bias: B2

Bias: B3

Bias: B4

Low Loss

Isolation

-100 mA

+100 mA

+25 mA @ +28 V

-25 mA

Isolation

Low Loss

+28 V

+100 mA

-100 mA

+28 V

Port

J0 - J1

Ant Bias (P1-pin 3)

TX Bias (P1-pin 1)

RX Bias (P1-pin 7)

DC Bias (P1-pin 5)

TX-ANT Low Loss &

TX-RX Isolation

+5 V @ +100 mA

0 V @ -100 mA

+28 V @ +25 mA

0 V @ -25 mA

ANT-RX Low Loss &

RX-TX Isolation

+5 V @ +100 mA

+28 V @ 0 mA

0 V @ +100 mA

+28 V @ 0 mA